3.0 LITER I6 GAS. Hose. MAIN. PartQualifier: to cylinder head. to cylinder head. Bypass Pipe to Cylinder Head. Engine Coolant Bypass Hose. Flexible hose that is part of the engine cooling system. Pipe that is part of the engine cooling system. Radiator Coolant Hose Adapter. B. Connector. Engine Bypass. Engine Pipe. Radiator Adapter.